The name is Idina Menzel and she'sone of Broadway's biggest voices -- known for the role of Maureen Johnson in Rent, Wicked's green-faced witch Elphaba and now starring in If/Then. She also appeared opposite Amy Adams in 2007's Enchanted and has hit the iTunes charts more than few times after multiple appearances on Glee.

At Sunday's ceremony, she performed "Let It Go" from Frozen moments before it was named best original song.